Unroll the puff pastry sheet onto the baking pan. Using a knife, lightly score around the puff pastry sheet, about 1/2-inch from the edge. Be careful not to cut all the way through. Using a fork, prick holes all over the entire surface of the puff pastry sheet, within the scored lines. Using a silicone brush, lightly brush a very thin layer of beaten egg across the entire surface of the puff pastry sheet, including and especially around the border. You will only use up a little bit of the egg.Bake for about 15 minutes, or according to the directions provided with your puff pastry sheet, until the puff pastry is golden brown. Remove from oven and allow to cool.